Tapered feed roller



fr grinding drums Patented Aug., 30?, i932 sereni* Price JoHN A. NYLUND, or P'ORTLAND, oitGoN TAPERED FEED ROLLER Application filed November 20, 1929. Serial No. 408,619.

My invention is for use as feed rollers for the feeding of sheets or strips under substantial pressure through drums as in sanding machines,` in veneer plants and in the .a polishing and treating of all forms of sheet stock as paper, veneers, ply-wood, metal strips and the like.

The invention consists primarily of a frame having drums, or sanding rolls or disposed therein a-nd through which the material is fed to be polu ished, ground, surfaced, or finished.

I have observed that in the passing o-f stripsof material to-be surfaced or finished t? through sanding machines that, where a substantial pressure is applied, in order to increase the grinding capacity of the drums a substantial curvature is placed within the drum or roll. This curvature produces a 2Q finished surface that lies in a single plane.

Through the use of my new and improved device the grinding sheet will last longer and will maintain a substantial uniform alignment over a relatively long period.

'25 This not only gives the finished product a higher utility, but a much better finish as well.

One of the objects of my new and improved device is to increase the capacity of machines 3* where relatively narrow strips are being fed through the machine.

- A further object of my invention consists in providing sanding or grinding or polishing drums to which a greater pressure may il; be applied. This greatly increases the grinding capacity of the drums and at thesame time produces a finished sheet or strip, the

surface of which will lie in a single plane.

A further object of my invention consists ,49 in providing simple means for increasing the life ofthe grinding sheet that is placed about the grinding or polishing drums.

With these and incidental objects in view, the invention consists in certain novel fea- 45 tures of construction and combination of parts, the essential elements of which are set forth in the appended claims, and a preferred form of embodiment of which is hereinafter shown with reference to the drawing which` accompanies and forms a part of this specification.

In the drawing:

Fig. l is a sectional, side view of a grinding Amachine having the principle of my device embodied therein.

F ig. 2 is asectional, end view taken on line 5-5 of Fig. l, looking in the direction indicated, the same being made to illustrate feed rolls that uniformly taper from the center towards the oppositely disposed ends. A

Fig. 3 is a side view of tapered feed rolls. The same is for use in feeding a plurality of strips continuously and simultaneously through the machine. f

Fig. 4 is a sectional, side view of a single grinding andv finishing drum, and illustrating the tendency in drums that have uniform diameter to become of a smaller diameter in' ilzhe center than at the oppositely disposed enc s;

Fig, 5 is a' side view, in section,- of feed rolls or grinding drums made asl having a uniformly tapered cross section and being largerin diameter at the center than at the oppositely disposed ends.

. Fig. 6 is a side view, illustrating a tempered roll4 made to compensate for the bend in'v 'the'roll when the same is being driven at high speed and where a heavy pressure is applied to'th'e'center of theroll. l

l Like p reference characters refer to like parts throughout'v the severalv views.` I

TheV lframesy of the machine are illustrated at 1 andQ-A and' have sets of feed' rollers 3 and 4' disposed therein and' j ournaled within the sidewalls of the frame. Sets of grinding, or polishing, drums are shown at 5 and 6 and are in spaced relationship with thev sets of feed rollers.

Y I have observed that inthe use'of sanding and polishing drums yand especially in veneer plants, or ply-wood plants where sheet stock is being fed through the machines, that there is ai tendency 'to produce Ynish-ed mafte'rial having surfaces that do not lie in aV f dle the-stock at. a higher rate of speed and Vso produces a finished product ythat hasa higher merchantable value. mThe capacity of machines is also greatlyincreased.-

pered roll, acompressible coverpla-ced' about the roll to produce a true cylindrical drum v and a grinding element placed about the cylinder.-

2. In a combination in a grinding drum of a tapered roll, a compressib'le' element disposed about lthe core of the roll, saidcompressible eledevice of the class described, the o ment being thicker at its ends than kat the l center and an' abrasive v elementY disposed4 about the outer surface of element.-

JOHNLYNYLD.

the compress'ible `the 'r preferably form my reed reus', .as inns;M

' trated at 7 and 8 in Fig. 3 that have their "'i 'Y 'l .l i I l greatest diameter midway, the ends yof the l same and uniformly taper towards the` end from the center. When the rolls areso madey aV pluralityiof strips shown here as three'in Vnumber 9, 10 and 11 may be continuously fed throughtherolls and each vofthe strips may be gripped sufficiently-to uniformly feed each of the strips through the rolls. A. lresilient 'A covering 12 is sometimes placed aroundy the drum-13 and the sheet grinding material, as sand paperV 14C, isplaced about the resilient element 12. Where the material has a greater diameter. or a .greater thickness at its ends thanity has in the center, a compensating resultk may beobtained withequal facility ifV the ydrumbe made as illustrated in Fig. 61

whereinfits. maximum diameter is greater towards the ends'of the feed portion of the 4 'feedrollers Itis especiallyidesirable:where a relatively wide sheet 15, as illustrated in Fig. 2 is being rollers 16 and 17 have their maximum'dameter at Vthe central portion and uniformly taper at k'the oppositely. disposed ends. Where a relatively high pressure isbeing developed between the rolls, there is a tendency for therolls to' spring sufficiently so passed through'the rollers 16 and 17 that the l i f that the sheet 15V being passed through' the 'l rollsrwill be thinner at its edges than it is in -the center. y. It isr to correct this tendency Vthat I make the rolls tapered and to createv a device that will produce `a sheet having uniform' thickness from edge to edge yand to increase they pressure-between the grinding or polish- `ing drums.'V A

form; of mechanism herein shown While the Y and -described is ladmirably adapted to full fill the objects-primarily stated, it is tobe 'understood' that it; is not' intendedto confine theinven'tion to the one form of'embodi- Y menther'ein-shown and described, as itis susceptible of embodimentin various forms, allv comingwithin .thescope of the claims which follow.`

Y What Ikclaim is: 't il. Inadeviceofthe class: described, a ta- 

